Power Allocating Apparatus

1. A power allocating apparatus applied in a plurality of power supply modules, wherein the plurality of power supply modules are coupled to a plurality of loads via a plurality of power lines, respectively, the power allocating apparatus comprising: a first switch element, having a first connecting terminal and a second connecting terminal coupled to a first output terminal of at least one of the plurality of power supply modules with a first power conversion rate and a second output terminal of at least one of the plurality of power supply modules with a second power conversion rate, respectively, for selectively allocating a power generated by the power supply module with the first power conversion rate to a predetermined number of loadings simultaneously according to on or off states of the first switch element; and a control device, coupled to the first switch element, for generating the control signal to control the first switch element to enter an on state or an off state; wherein the first power conversion rate is higher than the second power conversion rate; wherein the power supply module with the second power conversion rate is turned off when the first switch element is under the on state.

2. The power allocating apparatus of claim 1 , wherein the first switch element is a bidirectional switch.

3. The power allocating apparatus of claim 1 , further comprising: a diode, having an anode coupled to the second output terminal of the power supply module with the second power conversion rate and a cathode coupled to the second connecting terminal of the first switch element.

4. The power allocating apparatus of claim 1 , further comprising: a second switch element, coupled between the second output terminal of the power supply module with the second power conversion rate and the second connecting terminal of the first switch element, wherein the second switch element is not conductive when the first switch element is conductive.

5. The power allocating apparatus of claim 1 , wherein the second switch element is a unidirectional switch.

6. The power allocating apparatus of claim 1 , wherein the control device is a boost driving circuit, a buck-boost driving circuit, or a flyback driving circuit.

7. The power allocating apparatus of claim 1 , wherein the control device comprises: a driving circuit, for generating the control signal; and a timing control circuit, coupled to the driving circuit, for selectively outputting the control signal generated by the driving circuit according to an output signal generated by a power protection circuit.

8. The power allocating apparatus of claim 7 , wherein the driving circuit is a boost driving circuit, a buck-boost driving circuit, or a flyback driving circuit.

9. The power allocating apparatus of claim 7 , wherein the timing control circuit comprises: a bipolar junction transistor (BJT), having a base terminal, an emitter terminal coupled to an output terminal of the driving circuit, and a collector terminal; a first resistive element, coupled between the emitter terminal and the base terminal of the BJT; a field effect transistor (FET), having a drain terminal, a source node coupled to a reference voltage, and a gate terminal coupled to the output signal; and a second resistive element, coupled between the base terminal of the BJT and the drain terminal of the FET.

10. The power allocating apparatus of claim 7 , wherein the control device further comprises: a detecting circuit, coupled to the timing control circuit and the first output terminal of the power supply module with the first power conversion rate, for detecting an output power generated by the power supply module with the first power conversion rate to selectively output the control signal generated by the timing control circuit to the first switch element.

11. The power allocating apparatus of claim 10 , wherein the detecting circuit comprises: a first BJT, having a base terminal, an emitter terminal coupled to an output terminal of the timing control circuit, and a collector terminal; a first resistive element, coupled between the emitter terminal and the base terminal of the first BJT; a second BJT, having a base terminal, a collector terminal, and an emitter terminal coupled to a reference voltage; a second resistive element, coupled to the base terminal of the first BJT and the collector terminal of the second BJT; a third resistive element, having a terminal coupled to the base terminal of the second BJT; and a zener diode, having an anode coupled to another terminal of the third resistive element, and a cathode coupled to the first output terminal of the power supply module with the first power conversion rate.

12. The power allocating apparatus of claim 1 , wherein the control device comprises: a driving circuit, for generating the control signal; and a detecting circuit, coupled to the driving circuit and the first output terminal of the power supply module with the first power conversion rate, for detecting an output power generated by the power supply module with the first power conversion rate to selectively output the control signal generated by the driving circuit to the first switch element.

13. The power allocating apparatus of claim 12 , wherein the driving circuit is a boost driving circuit, a buck-boost driving circuit, or a flyback driving circuit.

14. The power allocating apparatus of claim 12 , wherein the detecting circuit comprises: a first BJT, having a base terminal, an emitter terminal coupled to an output terminal of the driving circuit, and a collector terminal; a first resistive element, coupled between the emitter terminal and the base terminal of the first BJT; a second BJT, having a base terminal, a collector terminal, and an emitter terminal coupled to a reference voltage; a second resistive element, coupled to the base terminal of the first BJT and the collector terminal of the second BJT; a third resistive element, having a terminal coupled to the base terminal of the second BJT; and a zener diode, having an anode coupled to another terminal of the third resistive element, and a cathode coupled to the first output terminal of the power supply module with the first power conversion rate.